# ADR-107: AwoooP Control Plane Storage Strategy

**Status**: Accepted
**Date**: 2026-05-01
**Scope**: AwoooP control plane storage, contract materialization, cache/watch, K8s projection

## Context

ADR-106 defines AwoooP as the multi-tenant Agent Platform with six contracts:

- Project / Tenant
- Agent
- MCP Gateway
- Policy / Routing
- Runtime / Run State
- Communication / Channel Event

Those contracts need a physical source of truth. The key question is whether
the AwoooP control plane should be implemented as Kubernetes CRDs first, or as
PostgreSQL tables first.

AwoooP must serve more than Kubernetes:

- AWOOOI on K3s is the first runtime host and tenant.
- EwoooC / MOMO PRO currently runs Docker workloads.
- Tsenyang, Bitan, LINE, Slack, Email, and API entrypoints may not all be
  Kubernetes-native.
- Runtime state, audit, budget, approval, and conversation events are
  high-volume product control-plane data, not only deployment desired state.

ADR-105 already established the local pattern for MCP RAG: keep PostgreSQL +
pgvector + Redis hot cache as the source of truth unless scale, latency, or
tenant isolation requires a later split.

## Decision

### D1 - Use PostgreSQL as the Control Plane Source of Truth

AwoooP v1 uses PostgreSQL as the authoritative store for the six contract
families and runtime governance state.

PostgreSQL owns:

- contract drafts and immutable published revisions
- active revision pointers
- tenant/project records
- agent registry and version metadata
- policy and routing revisions
- MCP tool registry, grants, and audit summaries
- budget ledgers and hard-stop state
- ACL subjects and project access
- run state and approval state
- channel event and outbound delivery state
- audit and trace correlation records

Kubernetes etcd is not the source of truth for these records in v1.

### D2 - Materialize Contracts as Versioned Revisions

Each published contract must produce an immutable revision.

Minimum revision fields:

- `contract_family`
- `contract_id`
- `revision_id`
- `version`
- `lifecycle_status`
- `body_json`
- `body_schema_version`
- `body_hash`
- `created_by`
- `created_at`
- `published_at`
- `supersedes_revision_id`

Runtime reads only published or active revisions. Mutable drafts are never used
for runtime decisions.

### D3 - Keep Artifact Bodies Out of Control Tables

Large or independently governed artifacts are stored by reference plus hash:

- system prompts
- JSON Schemas
- eval suites
- policy fixtures
- replay fixtures

The database stores:

- artifact ref
- SHA-256 hash
- artifact type
- expected schema version

This makes historical runs replayable without stuffing large prompt bodies into
every contract row.

### D4 - Use Redis for Cache and Watch, Not Authority

Redis is allowed for:

- effective policy cache
- agent contract cache
- project boundary cache
- rate limit counters
- short-lived session hot state
- contract revision invalidation
- worker coordination

Redis is not allowed to be the only source of truth for:

- contract revisions
- active revision pointers
- budget hard-stop decisions
- run terminal state
- approval decisions
- audit history

Any cached value used by runtime must carry the source `revision_id` and
`body_hash`.

### D5 - Use Kubernetes CRDs Only as Runtime Projection

CRDs are not the primary control-plane database in v1.

Allowed future CRD projections:

- `AwoooPRuntime`
- `AwoooPWorker`
- `MCPServerBinding`
- `ChannelIngress`
- `TenantRuntimeBinding`

These CRDs describe Kubernetes runtime wiring, deployment, service exposure, and
MCP server binding. They do not own product contracts, budgets, run state,
conversation events, or audit ledgers.

If an operator is later built, it should project from PostgreSQL into Kubernetes
objects, not require Kubernetes CRDs to become the source of truth for all
AwoooP state.

### D6 - Define Read Paths by Stability

| Data | Source of truth | Runtime read path |
|---|---|---|
| Contract draft | PostgreSQL | Admin/API only |
| Published contract revision | PostgreSQL | DB read + Redis cache |
| Active revision pointer | PostgreSQL | DB read + Redis invalidation |
| Prompt/schema/eval artifact | Git or object storage | Ref + hash from DB |
| Effective policy | PostgreSQL-derived | Redis cache with revision IDs |
| Run state | PostgreSQL | Worker writes DB, optional Redis notification |
| Budget hard stop | PostgreSQL | DB transaction + Redis hot counter |
| Rate limit | PostgreSQL policy + Redis counter | Redis counter, DB policy |
| Audit history | PostgreSQL | DB append/query |
| K8s runtime wiring | CRD projection | Kubernetes watch |

## Consequences

### Benefits

- AwoooP remains useful for Docker, Next.js, API-only, and future non-K8s
  tenants.
- Product governance data can be joined with incidents, Playbooks, KM, budget,
  and audit records.
- Contract changes are transactional and replayable.
- Runtime can use Redis for speed without risking split-brain authority.
- K8s CRDs remain available for the infrastructure layer without forcing all
  business control-plane data into etcd.

### Costs

- AwoooP needs explicit schema and migration discipline before runtime code.
- Runtime workers must implement revision-aware caches.
- K8s operator work, if needed later, must include a projection layer.

### Risks

- PostgreSQL schema can become a dumping ground if contract families are not
  modeled explicitly.
- Redis cache can become stale if invalidation is not versioned by revision and
  hash.
- Future CRDs can drift from DB state if projection reconciliation is not
  audited.

### Mitigations

- Every runtime decision records `revision_id` and `body_hash`.
- Active revision changes must emit an invalidation event.
- Contract publish is append-only; do not mutate published `body_json`.
- CRD projection writes must be reconciled and auditable.
- High-volume audit/event tables should be partitioned before production scale.

## Non-Goals

- This ADR does not create database migrations.
- This ADR does not create AwoooP directories or runtime services.
- This ADR does not introduce Kubernetes CRDs.
- This ADR does not choose Temporal, Celery, Redis Streams, or another worker
  engine.
- This ADR does not change paid provider behavior.

## Acceptance Criteria

- PostgreSQL is declared as the v1 AwoooP control-plane source of truth.
- Redis is limited to cache/watch/counter responsibilities.
- Artifacts are referenced by ref + hash rather than copied into every runtime
  record.
- CRD-first is explicitly rejected for v1.
- Future CRDs are limited to Kubernetes runtime projection.
- ADR-106 and the task-routing docs point to this ADR.

## References

- `docs/adr/ADR-105-mcp-agent-loop-governance.md`
- `docs/adr/ADR-106-agent-platform-architecture.md`
- `docs/LOGBOOK.md`
- `docs/12-agent-game-rules.md`
